chargemaster is fine, I got mine from the us for cheap.
Of course, if money was no issue, I would have at least 2 running at the same time because it's a bit slow.
(fill case, seat bullet, wait for next charge to finish)
Right now I don't double check the weight on another scale. Chargemaster accuracy is good enough for now(probably +- .1gn) , and already way better than volumetric throwing. (which gave me a +-1 grain variation with IMR4350 back then)